Completed riveting of the rear fuselage skins in preparation for mounting the veritcal stabalizer. Cleaned up and bolted the F-981 attach plate to the horizontal stabalizer. Trimmed the vertical stabalizer front spar and clamped the vertical stabalizer into position. Measured the vertical stabalizer for vertical position. Also measured the height of the rear spar and clamped into position. Then measured the vertical stabalizer hinge brackets and adjusted the front spar location to attain a straight line between the hinge brackets. Now ready for drilling.